George maetz



TATESP QFFIOE.

` speemafipnafnemers Patent No. 12,486, cated Marche, 1855.

- To @ZZ whom t may coaceoh Be it known tha tI, Gnoizcn MAR'rz, of

"Pottsville,inxthecountyfof Schuylkill and t State of Pennsylvania,"have invented anew `and juseful Improvement "in Coal-Screens;

`and I do hereby declare `that thefollowing isa full and exact description thereof, refer-` ence being hadfto theaccompanyiiig drawings, making a part of this specification.

`The screens heretocre used forl separating "the different sizes of coal from each other andfromgthecoal dust, have been conu structed in such `a manner that the coarsest coal has `to Ipassvover the entire surface `of the finer portionof the screen, and bethe `last discharged ""therefrom. The `objection to this arrangement `is, that the finer por*- tions of the screen are injured and fsoon dest-royedby the action of the coarsest "and heaviestportions `oiithecoal in passing over c them.` This injuriousyaction is preventedby my improvement the compound `coal i, screen.

H `My improvementfconsists in combining lthelcoarse meshed conical screen b, andcon- "ducting tube d, witha rearward discharging coal screen insuch` a manner that thesaid conical screenvwillreceive the coal to be 'screened atfitsrearend, and allow all but the coarsest portion `thereoil to pass through fitsf meshes into the` rearward discharging screen, `while "itconducts `the said coarsest `portionof the calbtorward and discharges i. thesame atitsfmouth." w

y The inoutlnforlfront end `ofl the fconical j `screen @and also theifront `ends oftherearward discharging portions l, e., ofthe screen,

. aresecuredtoflanches `which project rear- "Vsecured to the diskfc, and the said disk c,`

The rear end of the conical screen I), is

` is connected `by means of radiating arms to the screensupporting band 7L.

The screen b, tapers to such a degree that its lower side inclines forward from a horizontal line`,the same degree that the rearward discharging portions of the screen incline toward the rear. c The meshes of the said conical screen, are of such a size that they will arrest the coarsest portion of the coal and discharge itat the front of the screen; while all the finer coal kwill pass through the meshes of the conical screen into the` rearward discharging portions of the screen, and by them be conducted to the rear, and each size be separated :fromV the` vothers and be deposited in separate receptacles in thel usual manner. The conduct-ing tube a, is connected to the arms i, z', of the cog wheel g, and its sides are parallel with the sides of the rearward conducting portions d, e, of the screen. The rearward conducting portions of the screen may be arranged and supported in any usual manner. What I claim as my invention and desire to secure by Letters Patent, is-

The within described improvement in coal screens, by whichthe coarsest coal is sepa` at the mouth ofthe screen, while the ner rated the one from the other in the usual manner.

l The above specification of my new and useful improvement in coal screens signed and witnessed thisvQOth day of `January 1855. i

` .i Witnesses:

Guo. W. ADAMS, Z. C. ROBBINS.

,GEORGE Maerz.

rated from the iiner sorts yand discharged.

sorts of coal are carried forward and sepa- Y 

